I bought a pair of Pewters three yrs ago. A 1.1 pair that came from a good friend and breeder. He sexed both snakes in front of me at the show. I raised them up for two years and this season tried breeding them. As soon as I put the male in, things didnt go well. So I tried again a week later with the same results. I knew something was wrong. I probed them and were both males. Now I wasted two years of feeding and pushing a male to 1500 grams. The only difference my friend made the situation right. So always sex your snakes before breeding season. And remember males can sometimes really hold back there penes when popping them.
Matt